US5510150A - Jet coating method - Google Patents
Jet coating method Download PDFInfo
- Publication number
- US5510150A US5510150A US08/305,078 US30507894A US5510150A US 5510150 A US5510150 A US 5510150A US 30507894 A US30507894 A US 30507894A US 5510150 A US5510150 A US 5510150A
- Authority
- US
- United States
- Prior art keywords
- web
- jet
- coating mix
- coating
- slot orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0283—Flat jet coaters, i.e. apparatus in which the liquid or other fluent material is projected from the outlet as a cohesive flat jet in direction of the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
Definitions
- the present invention relates to a jet coating method for applying a coating mix onto a moving web in a non-contacting manner at ambient pressure.
- EP patent application 0,466,420 discloses a jet coating method in which a jet coating apparatus is employed for applying the coating mix on the web and the final coat weight is controlled by means of an actual doctor blade.
- the coating mix is applied on the web in ambient pressure without a pressurized coating chamber.
- the jet coating unit of the apparatus is tiltable about its tip, thus permitting when necessary an almost perpendicular application of the coating mix jet onto the web.
- problems are caused by entrained air carried over in the web and applied coating mix, resulting in inferior coat quality, mottling and possibly uncoated areas.
- the air entrained in the web causes unevenness of the applied coat. Sufficient penetration of the mix into the web is also difficult to attain.
- FI patent application 89 0249 U.S. Pat. No. 5,104,697
- a brush coating apparatus in which the coating mix is applied onto the web via a channel of narrow slot orifice with the help of a predoctoring blade tilted to a narrow angle with respect to the web.
- the embodiment also incorporates a doctor blade arranged at the same backing roll.
- This embodiment has problems in some operating situations particularly when the tension distribution of the base web is uneven, whereby the two points (coating apparatus and doctor blade) contacting the web produce a deleteriously uneven distribution of cross-machine web tension between these two points. Such a situation causes runnability problems under certain conditions.
- the invention is based on designing the apparatus such that it directs a coating mix jet from a jet coating apparatus, which is noncontactingly outdistanced from the web, in ambient pressure at least partially counter to the machine direction of the web.
- the directional vector of the coating mix jet which exits the slot orifice has a component opposite to the machine direction of the web.
- the jet coating apparatus is characterized by a slot orifice defined by bounding surfaces of an upper lip and a lower lip.
- a directional vector located within the slot orifice along the bounding surface of the lower lip having a vector component that is opposite to the tangential velocity vector of the moving web.
- the jet coating method according to the invention is characterized by directing a jet of coating mix counter to the approach direction of the web at a velocity sufficient to split the jet into a return flow and a coating mix application flow.
- the invention provides significant benefits.
- FIG. 1 shows a longitudinally sectional side view of a jet coating apparatus according to the invention.
- FIG. 2 shows a detail of the embodiment illustrated in FIG. 1.
- FIG. 3 shows an alternative embodiment to that illustrated in FIG. 2.
- FIG. 4 shows a longitudinally sectional side view of another jet coating apparatus according to the invention.
- a tangent line drawn tangentially to the surface of a backing roll 1, at the slot orifice 5 of a jet-coating apparatus which is placed essentially under the backing roll 1, is denoted by a dashed line 7.
- the jet coating apparatus comprises an upper lip 2 and a lower lip 3.
- the slot orifice 5 of the coating apparatus is formed by a curved slot orifice bounding surface 9 of the upper lip and a conformantly curved slot orifice bounding surface 11 of the lower lip 3.
- the path of the coating mix starts as a narrow channel 6, which typically further tapers into the slot orifice 5.
- the width of the channel 6 is initially approx. 0.5-10 mm, typically in the range 1.5-4 mm.
- the channel 6 must extend in the cross-machine direction at least over the cross-machine width of the web 14.
- the width of the slot orifice 5 is typically in the range 0.5-10 mm.
- the spacing at the gap 8 between the jet coating apparatus and the backing roll 1 (web 14) is typically 1-20 mm, advantageously approx. 3-8 mm.
- the width of the gap 5 is adjustable by a screw 4. This spacing adjustment affects the coating mix flow velocity. With a constant-volume feed, the coating mix exit velocity increases when the slot orifice 5 is adjusted smaller.
- the upper lip 2 can be arranged adjustable with respect to the coater frame, thus permitting also a cross-sectional adjustment of the channel 6 when necessary.
- the curved tip 9 of the upper lip 2 induces the known Coanda effect, whereby the coating mix jet tends to adhere to the bounding surface of the upper lip 2 in the gap 8.
- the radius of curvature of the tip 9 can vary in the range 1-50 mm; however, the radius of curvature is typically in the range 3-10 mm.
- a conventional doctor blade 12 is provided at the roll 1 downstream of the jet coating apparatus.
- a normal 13 is drawn to the tangent 7 at the backing roll 1 (and the web 14) at the slot orifice 5.
- the coating mix jet exiting the slot orifice 5 can be characterized by two angles:
- ⁇ ' angle between the jet upper surface and the normal 13, or the trailing angle
- ⁇ " angle between the jet lower surface and the normal 13, or the back angle.
- the average angle, jet tilt angle ⁇ is obtained as the average of these angles, or ( ⁇ '+ ⁇ ")/2.
- the angle ⁇ can be adjusted by means of
- the design of the curved channel according to the diagram has the basic requirement that the slot orifice bounding surface 11 of the lower lip 3 in the region of the slot orifice 5 is curved toward the approach direction of the web 14, whereby a desired direction of the coating mix jet is attained. Further, the velocity of the coating mix jet must be sufficiently high to attain the splitting of the jet stream into two flows 16 and 17. A sufficient limit velocity is 1.5 m/s when the distance of the slot orifice 5 from the web is 3 mm, the slot orifice width is 2 mm and the web speed is 1000 m/min. The minimum limit velocity of the jet will be higher if the distance of the slot orifice 5 from the web surface is wider. Increasing the web speed also has an effect of increasing the minimum limit velocity of the coating mix jet. A desirable jet velocity is achieved by means of an efficient coating mix pump (not shown).
- the basic principle of the invention is to design the slot orifice structure such that it has the trailing angle ⁇ '>0°, whereby the coating mix jet is directed counter to the machine-direction of travel of the web 14.
- the angle ⁇ ' can be varied in the range 0° ⁇ ' ⁇ 90°, typically 0° ⁇ ' ⁇ 60°.
- the total flow 15 of the coating mix jet is split after the slot orifice 5 into two branches, a return flow 16 and a coating mix flow 17.
- the return flow 16 represents approx. 30-60% of the total flow 15.
- the proportion of the return flow is approx. 50%.
- the invention can be characterized by the directional vector 18 along the slot orifice bounding surface 11 of the lower lip 3, whereby said vector can be divided into a vector component 21 orthogonal to the tangential velocity vector 19 of the web and a vector component 20 opposite to said tangential web velocity vector.
- a prerequisite for the correct aiming of the coating mix jet is the existence of said oppositely directed vector component 20.
- the vector 18 can also be defined through the angle ⁇ '.
- the vector 18 also subtends the angle ⁇ 'with the normal 13.
- the embodiment according to FIG. 3 has the radius of curvature r slightly increased and the bounding surface 11 shortened, whereby the angles ⁇ and ⁇ ' and will become smaller.
- the lower lips 3 illustrated in FIGS. 3 and 4 are easily replaceable with a flexible blade, thus making the apparatus conveniently convertible for use with different web materials and coating mixes.
- FIG. 4 illustrates an alternative embodiment according to the invention having the slot orifice bounding surfaces 9 and 11 designed essentially uncurved.
Abstract
Description
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/305,078 US5510150A (en) | 1992-01-26 | 1994-09-13 | Jet coating method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI924841A FI105533B (en) | 1992-10-26 | 1992-10-26 | Spray Coating Apparatus and Method |
FI924841 | 1992-10-26 | ||
US14272893A | 1993-10-25 | 1993-10-25 | |
US08/305,078 US5510150A (en) | 1992-01-26 | 1994-09-13 | Jet coating method |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14272893A Division | 1992-01-26 | 1993-10-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
US5510150A true US5510150A (en) | 1996-04-23 |
Family
ID=8536107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/305,078 Expired - Fee Related US5510150A (en) | 1992-01-26 | 1994-09-13 | Jet coating method |
Country Status (9)
Country | Link |
---|---|
US (1) | US5510150A (en) |
JP (1) | JPH06198242A (en) |
KR (1) | KR100280185B1 (en) |
CA (1) | CA2108841A1 (en) |
DE (1) | DE4336365B4 (en) |
FI (1) | FI105533B (en) |
FR (1) | FR2697176B1 (en) |
GB (1) | GB2272390B (en) |
SE (1) | SE511999C2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998020202A1 (en) * | 1996-11-04 | 1998-05-14 | Valmet Corporation | Method and arrangement for coating a moving paperboard web |
WO1998050169A1 (en) * | 1997-05-09 | 1998-11-12 | Valmet Corporation | Method and apparatus for coating paper board and paper |
WO1999029958A1 (en) * | 1997-11-21 | 1999-06-17 | Valmet Corporation | Coating station and coating method |
US6190726B1 (en) * | 1996-10-28 | 2001-02-20 | Valmet Corporation | Method and apparatus for coating a moving web of paper or paperboard using a controlled coating jet |
DE102011076748A1 (en) | 2010-06-04 | 2011-12-08 | Metso Paper, Inc. | Jet nozzle structure comprises nozzle applicator for applying medium e.g. coating medium on moving surface, comprising feed chamber for receiving medium from feeding device, nozzle slit, and device for compensating slit opening distortion |
WO2020231878A1 (en) * | 2019-05-10 | 2020-11-19 | Keck Theodore J | Pickup truck tailgate storage carrier and resting surface |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI97817C (en) * | 1993-10-27 | 1997-02-25 | Valmet Paper Machinery Inc | Method and arrangement for coating a moving track |
KR100351593B1 (en) * | 1994-04-29 | 2002-10-25 | 미네소타 마이닝 앤드 매뉴팩춰링 캄파니 | Precise coating method for producing polymerizable film |
EP0701022B1 (en) * | 1994-09-09 | 2001-04-04 | Voith Paper Patent GmbH | Coating machine for applying directly or indirectly a fluid or pasty material onto a moving web |
US5525376A (en) * | 1995-02-02 | 1996-06-11 | Minnesota Mining And Manufacturing Company | Multiple layer coating method |
DE19651739A1 (en) * | 1996-12-12 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Web coating applicator |
DE19652827A1 (en) * | 1996-12-18 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Applicator for direct or indirect application of a liquid or pasty coating medium to a running material web, in particular made of paper or cardboard |
DE10245072A1 (en) * | 2002-09-27 | 2004-04-08 | Voith Paper Patent Gmbh | commissioned |
AT511413B1 (en) * | 2011-05-10 | 2015-02-15 | Steindl Roman Dipl Ing | METHOD FOR PRODUCING PAPER PRODUCTS |
EP3260802B1 (en) * | 2016-06-23 | 2019-10-09 | Valmet Technologies Oy | Nozzle for a device for contact-free treatment of a running fiber web |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4452833A (en) * | 1982-02-08 | 1984-06-05 | Consolidated Papers, Inc. | Paper coating method |
DE3446525A1 (en) * | 1984-01-07 | 1985-08-01 | Jagenberg AG, 4000 Düsseldorf | Apparatus for coating, with a controllable coating thickness, lengths of material running over a support roller |
US4537801A (en) * | 1982-05-25 | 1985-08-27 | Fuji Photo Film Co., Ltd. | Coating method and apparatus |
US4697542A (en) * | 1985-05-13 | 1987-10-06 | The Kohler Coating Machinery Corporation | Adjustable nozzle for coating equipment |
US4791879A (en) * | 1984-05-11 | 1988-12-20 | Oy Wartsila Ab | Apparatus for coating running webs |
US4834018A (en) * | 1984-10-19 | 1989-05-30 | J. M. Voith, Gmbh | Device for coating traveling material webs |
US4920913A (en) * | 1987-08-01 | 1990-05-01 | Jagenberg Aktiengesellschaft | Device for coating a web of material |
US4934310A (en) * | 1984-06-01 | 1990-06-19 | J.M. Voith Gmbh | Coating apparatus for coating moving sheet |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE653693C (en) * | 1934-05-26 | 1937-12-01 | Alfred Winkler | Adhesive application device for sheet layers consisting of stacked workpieces |
US3640752A (en) * | 1966-05-02 | 1972-02-08 | Fuji Photo Film Co Ltd | Coating method |
CH547127A (en) * | 1972-01-21 | 1974-03-29 | Bachofen & Meier Maschf | PROCESS FOR PERFORMING COATINGS ON WEB, SUCH AS PAPER, FILM, FILM OR PACKAGING MATERIAL, AND EQUIPMENT FOR IMPLEMENTING THESE. |
GB1443984A (en) * | 1973-11-28 | 1976-07-28 | Riggs & Lombard Inc | Liquid chemical treatment of running fabric webs |
GB1531321A (en) * | 1975-01-13 | 1978-11-08 | Nat Steel Corp | Coating weight-control methods and apparatus |
GB2057304B (en) * | 1979-08-27 | 1983-09-07 | Acumeter Lab | Adhesive applicator eg for cigarette filter tipping paper |
AU7696881A (en) * | 1980-11-21 | 1982-05-27 | Permacel | Extrusion coating |
FI71378C (en) * | 1983-09-16 | 1990-09-04 | Waertsilae Oy Ab | BESTRYKARE. |
JPH0824872B2 (en) * | 1988-06-07 | 1996-03-13 | 松下電器産業株式会社 | Coating device |
FI90634C (en) * | 1989-01-17 | 1994-03-10 | Valmet Paper Machinery Inc | Coating device and method for coating a web |
US5186753A (en) * | 1990-07-10 | 1993-02-16 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Fountain coater |
JP3034292B2 (en) * | 1990-10-23 | 2000-04-17 | 株式会社東芝 | Photosensitive solution application method |
DE4116729C2 (en) * | 1991-05-23 | 1993-11-25 | Voith Gmbh J M | Nozzle-like coating device for applying a coating slip to a running paper web |
-
1992
- 1992-10-26 FI FI924841A patent/FI105533B/en active
-
1993
- 1993-10-19 JP JP5261143A patent/JPH06198242A/en active Pending
- 1993-10-20 CA CA002108841A patent/CA2108841A1/en not_active Abandoned
- 1993-10-20 KR KR1019930021760A patent/KR100280185B1/en not_active IP Right Cessation
- 1993-10-22 FR FR9312606A patent/FR2697176B1/en not_active Expired - Fee Related
- 1993-10-25 DE DE4336365A patent/DE4336365B4/en not_active Expired - Fee Related
- 1993-10-25 SE SE9303494A patent/SE511999C2/en not_active IP Right Cessation
- 1993-10-26 GB GB9322030A patent/GB2272390B/en not_active Expired - Fee Related
-
1994
- 1994-09-13 US US08/305,078 patent/US5510150A/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4452833A (en) * | 1982-02-08 | 1984-06-05 | Consolidated Papers, Inc. | Paper coating method |
US4537801A (en) * | 1982-05-25 | 1985-08-27 | Fuji Photo Film Co., Ltd. | Coating method and apparatus |
DE3446525A1 (en) * | 1984-01-07 | 1985-08-01 | Jagenberg AG, 4000 Düsseldorf | Apparatus for coating, with a controllable coating thickness, lengths of material running over a support roller |
US4791879A (en) * | 1984-05-11 | 1988-12-20 | Oy Wartsila Ab | Apparatus for coating running webs |
US4934310A (en) * | 1984-06-01 | 1990-06-19 | J.M. Voith Gmbh | Coating apparatus for coating moving sheet |
US4834018A (en) * | 1984-10-19 | 1989-05-30 | J. M. Voith, Gmbh | Device for coating traveling material webs |
US4697542A (en) * | 1985-05-13 | 1987-10-06 | The Kohler Coating Machinery Corporation | Adjustable nozzle for coating equipment |
US4920913A (en) * | 1987-08-01 | 1990-05-01 | Jagenberg Aktiengesellschaft | Device for coating a web of material |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6190726B1 (en) * | 1996-10-28 | 2001-02-20 | Valmet Corporation | Method and apparatus for coating a moving web of paper or paperboard using a controlled coating jet |
WO1998020202A1 (en) * | 1996-11-04 | 1998-05-14 | Valmet Corporation | Method and arrangement for coating a moving paperboard web |
US6217940B1 (en) | 1996-11-04 | 2001-04-17 | Valmet Corporation | Method and apparatus for coating a moving paperboard web |
WO1998050169A1 (en) * | 1997-05-09 | 1998-11-12 | Valmet Corporation | Method and apparatus for coating paper board and paper |
US6306461B1 (en) | 1997-05-09 | 2001-10-23 | Valmet Corporation | Method and apparatus for coating paper board and paper with high- viscosity coating mixes |
WO1999029958A1 (en) * | 1997-11-21 | 1999-06-17 | Valmet Corporation | Coating station and coating method |
DE19882817B4 (en) * | 1997-11-21 | 2006-11-30 | Metso Paper, Inc. | Coating station and coating method |
DE102011076748A1 (en) | 2010-06-04 | 2011-12-08 | Metso Paper, Inc. | Jet nozzle structure comprises nozzle applicator for applying medium e.g. coating medium on moving surface, comprising feed chamber for receiving medium from feeding device, nozzle slit, and device for compensating slit opening distortion |
WO2020231878A1 (en) * | 2019-05-10 | 2020-11-19 | Keck Theodore J | Pickup truck tailgate storage carrier and resting surface |
Also Published As
Publication number | Publication date |
---|---|
FI924841A0 (en) | 1992-10-26 |
GB9322030D0 (en) | 1993-12-15 |
DE4336365B4 (en) | 2005-10-27 |
KR940008748A (en) | 1994-05-16 |
DE4336365A1 (en) | 1994-04-28 |
SE9303494D0 (en) | 1993-10-25 |
CA2108841A1 (en) | 1994-04-27 |
SE511999C2 (en) | 2000-01-10 |
GB2272390A (en) | 1994-05-18 |
FI924841A (en) | 1994-04-27 |
KR100280185B1 (en) | 2001-02-01 |
FR2697176A1 (en) | 1994-04-29 |
GB2272390B (en) | 1995-07-26 |
JPH06198242A (en) | 1994-07-19 |
FR2697176B1 (en) | 1997-01-10 |
FI105533B (en) | 2000-09-15 |
SE9303494L (en) | 1994-04-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: VALMET CORPORATION, FINLAND Free format text: MERGER;ASSIGNOR:VALMET PAPER MACHINERY, INC.;REEL/FRAME:007839/0376 Effective date: 19950831 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20080423 |